34 Fr « Buchenau. — Alismataceae. 



1 usque 1 5 mm longos vix aequantes. Flores iis E. grandiflori minores ; stamina 

 ca. 25. Carpella in fructum echinatum, sepalis plus minusve involutum congesta, 5- 

 usque 7-costata, stylo erecto longiuscule aristata; glandulae laterales plures.« 



Brasilien. 



Nota. Species speciminibus incompletis a cel. St. Hilaire lectis tantum cognita. 



Species imperfecte cognita. 



18 b . E. bracteatus Micheli in DG. Monogr. Phaner. III. (4 881) 59. — Rhizoma? 

 Gaules usque 2 m alti, folia superantes. Folium (unicum suppetens) amplissimum; la- 

 mina 35 cm longa, 25 cm lata, coriacea, rotundato-ovata, sinu lato circa quartam 

 partem aequante cordata, lobis rotundatis ; nervi primani 1 3 valde prominentes ; areae 

 punctis pellucidis vel lineis brevissimis praeclaris sparsis ornatae. Inflorescentia panni- 

 culata; verticilli 12 usque 15; bracteae coriaceae, lanceolatae, acutissimae, flores super- 

 antes; pedunculi ca. 5 mm longi, post anthesin reflexi; flores majusculi; sepala late 

 ovata, obtusa, dorso costata, post anthesin reflexa; petala obovato-cuneata, duplo triplove 

 longiora, albida; stamina 18; filamenta subulato-filiformia , antheris longiora. Fructi- 

 culi (immaturi) stylo brevi uncinato rostrati, pluricostati ; glandulae laterales 2 — 3. 



In Sümpfen der Landenge von Panama. Nur in zwei von Fendler und Hayn 

 gesammelten Exemplaren des Kew-Herbariums bekannt. 



1 9. E. ellipticus (Mart.) Micheli in DG. Monogr. Phaner. III. (1881) 51. — Sagittaria 

 palaefolia Nees et Mart. in Nova Acta Acad. nat. cur. XI. (1823) 21. — Alisma ellip- 

 ticum Mart. in Rom. et Schult. L. Spec. pl. VII. 2. (1830) 1607; Kunth, Enum. pl. III. 

 (1841) 51; Seub. in Fl. brasil. fasc. VIII. (1847) 107, 108, t. 13, flg. IV; 0. Ktze. 

 Rev. gen. III. (1895) 327. — Perennis; maxime variabilis. Rhizoma crassum. Caules 

 usque metrales et ultra, inferne teretes, striati, inter verticillos angulosi, folia superantes. 

 Folia magna, longe pedunculata, lamina valde variabilis (v. infra) ; areae plerumque lineis 

 longis pellucidis (sed interdum inconspicuis) ornatae. Inflorescentia racemosa vel panni- 

 culata; verticilli 8 usque 12, remoti, multiflori; bracteae basi vix connatae, lanceolatae, 

 longe acuminatae, pedunculis breviores; pedunculi 10 usque 20 mm longi, post anthesin 

 erecti vel recurvati; flores conspicui; sepala late ovata, obtusa, dorso costato-striata ; 

 petala longiora ; stamina ca. 21; filamenta filiformia, antheris oblongis longiora. Fructus 

 sphaericus, diam. ca. 6 usque 7 mm; fructiculi oblique ovati, ca. 3 mm longi, breviter 

 rostrati, lateribus costati, uniglandulosi. 



Micheli 1. c. p.*52 formae vel varietates sequentes distinguit: 



a. latifolia — »folia late ovata, basi emarginata vel sinu lato cordata, ca. 20 cm 

 longa, 15 cm lata«. 



ß. pubescens — »folia ovata, basi emarginata vel subcordata, 1 5 cm longa, 1 cm 

 lata; scapus superne, bracteae, pedicelli et sepala scabro-pubescentia«. (Alisma ^;?/te- 

 cens Mart. in Rom. et Schult. L. Syst. veget. VII. 2. (1830) 1608 pr. pte.) 



y. ovata — »planta elatior; folia ovata, utrinque attenuata, basi sensim in 

 petiolum decurrentia, apice breviter acuminata«. (Alisma Andrieuxii Hook, et Arnott, 

 Botany Beechey's Voyage VII. (1839) 311). 



ö. minor Seubert 1. c. — »planta multo minor; foliis quinquenerviis, scapo incurvo 

 vel flexuoso; an forma terrestris? 



Im tropischen Amerika von Mexiko bis Brasilien und Uruguay weit verbreitet. 



Nota. Species melius inquirenda, prob, in spec. nonnullas distribuenda. 



Nota. Alisma palaefolium Nees et Mart. nomen vetustissimum est. Cel. Micheli Bpe- 

 cimen authenticum vidit et propter lineas pellucidas laminae ad E. ellipticum ducit. 



20. E. longistylis Buchenau, n. sp. — Perennis; glaber. Caules erecti, validi, 

 inferne fere teretes et costato-striati, superne angulosi, inter verticillos triangulati, 40 

 usque 50 cm alti (vel ultra?). Folia usque 70 cm longa, longe petiolata; petiolus canali- 

 culatus; lamina coriacea, usque 20 cm longa, elongato-elliptica , septemnervia , apice 



